package com.home.free.lamble;

interface Com {
    int add(int a, int b);
}

abstract class A {
    abstract int add(int a, int b);
}

class B extends A implements Com {
    public int add (int a, int b) {
        return a + b;
    }
}

public class Sort {
    public static void main(String[] args) {
        B b = new B();

        Com com = b;

        System.out.println(com.add(12, 6));

        A a = b;

        System.out.println(a.add(10, 5));
    }
}
